Furnace gas burner



April 15, 1930. c. J. BROWN v FURNACE GAS BURNER Filed May 28, 1928 2Sheets-Sheet l inve@ for.' 651/454 ze JI' Eem/WV,

April 15, 1930. J, BROWN Y 1,754,603

FURNACE GAS BURNER Filed May 28, 1928 2 Sl'1eets-Shee1'. 2

Patented Api. 15, 1930 4uls'u'rlazo s'ra'ras 4Lite-1,603

CHARLES J. BnowN, or noNoRA, rnNNsYLvANm FUBNACE das BURNER Application`ilcd May 28, 1928. Serial No. 281,217.

, This invention relates to burners and, while not limited thereto,relates moreparticularly to gaseous fuel burners for use with annealino'furnaces and the like, and has for its object the provision of a novelburner con-v struction and mounting which will prevent entirel thedirect impingement ofthe flame from t e burner upon the object to beheated.

Another object is to provide a burner which will direct the flamebackward` against the refractory surface ofthe furnace wall in which theburner is mounted, so as to heat thewall to incandescence, and therebyindirectly transmit the heat to the article or articles to be heated byradiation rather 'than by conduction or convection.

A furtherobject is to provide a burner having the novel combination,construction and esignof vparts hereinafter described 20 and illustrated1n the, accompanying drawins.

l the drawings- Y .y f

Figure 1 is a transverse sectional view through an annealing furnacehaving the 215 novel burners of thls invention mounted therein.

Figure 2 is an enlarged sectional detail through a portion ofthe furnacewall and burner. i

Figure 3 is an enlarged sectional view of the head en d of one of theburners.

Fi ures 4 and 5 are views taken on the line V-IV and-V-V of Figure 2,respectively. y

Referring more articularly to the drawings, the letter A esignates thefurnace as a whole which is composed of bottom, side,

end and to walls of usual construction, ex.

cept that t ey are provided with a series of openings 2 in which sleeves3 are mounted to receive burners B.

The furnace walls at the inner end of each of the openings 2 'areprovided with concave recesses 5 adapted to receive the flame from theburners B. y The burners B are each composed of an outer air and gasmixing tube 6 spaced centrally within the sleeve 3 vand providedintermediate its ends with a T-fitting 7 The 5 tube 6 has its forward orfurnace end open,

proximately 30 degrees to the face of the furwhile its rear end ispartially closed by a cap 8 having a centrally arranged opening intcwhich a gas supply nozzle 9 is threaded. The cap 8 is provided with airinlet openings 10 through which primary' air is drawn to be mixed withthe gas from the nozzle 9. The nozzle 9 is connected to a gas supplyconduit 12 which leads from a gas main 13.

A secondary air conduit 14 for air under pressure enters into the mixingtube 6 through the T-ftting 7 and extends centrally through the tube 6to the forward or furnace end thereof. rlhe conduit 14 is connected toan air pressure main 15. y

A mushroom-shaped head 'member cornprising a hollow stem. 16 and anoutwardly Haring body portion 17, is threaded onto the forward orfurnace end of the secondary air conduit 1li. The body portion 17`extends transversely materiallybeyond the gas and air mixing tube 6.

The forward or furnace side of the body v portion 17 of the head isprovided with-a secondary air groove 18, and suitable openings 1 9 areprovided from the groove 18 into the hollow stem portion 16 of the headthrough which the secondary air passes to the groove.

A deiector plate 20 is secured to and is coextensive with the forwardend of the head land is spaced from the edge thereof so as to 80 provideanair discharge slot. VThe rear edge of the plate 20 is provided with arearwardly projecting and inwardly beveled flange 21 ada ted tocooperate with the peripheral edge of tf e body of said head to form arestricted discharge slot for the secondary air.

The curvature of the outwardly Haring body 17 of the burner head is suchthat the gas and air mixture fiowing from the mixing tube 6 will bedefiected approximately 90 degrees to the axis of the burner orsubstantially parallel to the face of the wall, while the ref stricted.outlet slot for the secondary air formed by the edge of the body 17 ofthe burner head and the ange 21 on the plate 20, will deflect thesecondary air rearwardly at an angle of approximately `60 degrees to theaxis of the burner and at an angle of apnace wall.

v tube 0 `air through the openlngs 10 1n the ca In o eration, the gasentering the mixing m the nozzle 9 will aspirate primary 8, which airwill mix with the gas as it ows throu h the tube 6. As the as and airmixture flgows out of the forwar end of the tube 6 it will be ignitedand, due to the novel shape of the mushroom burner head, the gas and airmixture will be deflected outwardly at an angle of substantially 90degrees or arallel with the face of the furnace wall.

he secondary air, which is under pressure, will flow from the conduit 14into the groove 18 and will be deflected back toward the furnace wall atan angle of approximately 30 degrees to the face of the wall, so as toblow the air and gas mixture back into the concave recess 5 in the wallwhich serves to spread the flame. The secondary air furnishes the airnecessary to complete combustion of the gas.

Due to the fact that the burning gas and air mixture is forcedrearwardly and spread over the furnace wall so as to heat the wallitself to incandescence, the wall will then transmit the heat to theannealing box or other charge to be heated by radiation rather than byconduction or convection.

While I have shown and described one specific embodiment of myinvention, it will be understood that I do not wish to be limitedthereto since various modifications may be made without departing fromthe scope thereof, as defined in the appended claim.

I claim- The combination with a furnace wall having a concave recesstherein and an opening through said wall centrally of said recess and asleeve mounted in said wall, of a burner mounted in said sleeve andspaced from the side walls thereof, said burner comprising a. gas andair mixing tube open at each end, a gas supply tube projecting into therear end of said tube and adapted to produce an aspirating effect todraw primary air through the open rear end of the mixing tube, asecondary air tube leading from a source of air under pressure andmounted centrally within said mixing tube and lterminating adjacent theforward end thereof, a mushroom-like head mounted on the forward end ofsaid secondary air tube and spaced from the forward end and side wall ofsaid mixing tube so as to provide a passageway for the mixture of airand gas from said mixing tube, said head having its rear face curved soas to deflect the air and gas mixture on a line extending approximatelydegrees to the burner axis, and said head having its forward facegrooved to form an air passage, a plurality of openings from said grooveto the interior of said head through which the secondary air underpressure is adapted to pass, and a baffle plate secured to the forwardend of said head and extending beyond said groove, said plate m hand.

y CHARLES J. BROWN.

